Figure 4.

SWCNTs enter the neurons in brain through axoplasmic transportation [10]. (A) SWCNTs in the lysosomes of a neuron (arrows); (B) the magnification of the two lysosomes containing SWCNTs; (C) there are no SWCNTs in glial cells; (D) a bundle of SWCNTs parallel to the neurite in the section along the longitudinal axis of the neurite; (E) the SWCNTs are dot-like in the section vertical to the longitudinal axis of the neurite.